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Presentation based on paper: M. E. Gorbunov, A. V. Shmakov, S. S. Leroy, K. B. Lauritsen,

Processing of COSMIC radio occultation data and cross-center comparison. K. B. Lauritsen (DMI), M. E. Gorbunov (IAP), S. S. Leroy (HSEAS), A. V. Shmakov (IAP). Presentation based on paper: M. E. Gorbunov, A. V. Shmakov, S. S. Leroy, K. B. Lauritsen, Submitted to J. Atm. Ocean. Tech. (2010).

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Presentation based on paper: M. E. Gorbunov, A. V. Shmakov, S. S. Leroy, K. B. Lauritsen,

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  1. Processing of COSMIC radio occultation data and cross-center comparison K. B. Lauritsen (DMI), M. E. Gorbunov (IAP), S. S. Leroy (HSEAS), A. V. Shmakov (IAP) Presentation based on paper: M. E. Gorbunov, A. V. Shmakov, S. S. Leroy, K. B. Lauritsen, Submitted to J. Atm. Ocean. Tech. (2010) OPAC-2010

  2. COSMIC data & ECMWF fields • Processed COSMIC data: • 20 days from each of the years 2007, 2008, 2009 (from 2009: data version 2009.2650 starting April 1); • Processing of atmPhs files with OCC (similar to GRAS SAF ROPP_PP software); • Results are compared to: • - UCAR processed data: atmPrf files (refractivities); • - ECMWF analyses (refractivities); OPAC-2010

  3. OCC processing and options State of the art Fourier integral operator code (CT2) ensures high accuracy (GO used above 25 km) SO: optimal linear combination based on initialization to ECMWF or 2-parameter fitted MSIS climatology Quality control based on L2-signal and SO-solution: Q = QL2 + QSO Cutoff of u(t): at SLTA = -250 km Radio-holographic (RH) filtering: - phase: no; CT-amplitude: yes - full RH filtering results in positive bias from suppression of large BAs and MP structures in wide-band signal tails [Sokolovskiy, 2009] OPAC-2010

  4. OCC 2009: #occ About half the profiles penetrate down to 1 km OPAC-2010

  5. OCC-ECMWF: 2007 REF OPAC-2010

  6. OCC-ECMWF: 2008 REF OPAC-2010

  7. OCC-ECMWF: 2009 REF OPAC-2010

  8. OCC-UCAR: 2009 REF OPAC-2010

  9. Zoom on tropical bias, 2009 data OPAC-2010

  10. Tropics (0-300), with RH-filtering RH filtering: phase: yes CT-amplitude: yes OPAC-2010

  11. Tropics (0-300), with no RH-filtering RH filtering: phase: no CT-amplitude: no OPAC-2010

  12. OCC-UCAR: 2009 REF, alternative options Cutoff at SLTA = -150 km RH filtering: phase: yes 2-parameter MSIS fit OPAC-2010

  13. OCC-UCAR: 2009 REF, optimal options Cutoff at SLTA = -250 km RH filtering: phase: no Initialization to ECMWF OPAC-2010

  14. OCC-ECMWF differences : 2007, 2008, 2009 Change in ECMWF cycle 32r3 in 2008: i) COSMIC RO assimilated to surface ii) updated convection and entrainment physics OPAC-2010

  15. OCC-UCAR: 2009 raw BA OPAC-2010

  16. OCC-UCAR: 2009 Tdry OPAC-2010

  17. Results Comparison of OCC and UCAR refractivities for three different years (2007, 2008, 2009) Tropics: - relative difference is smaller than 0.1% for 2-30 km (and smaller than 0.03% for 9-25 km) - 0.2% bias below 1 km, due to different cutoff and filtering OPAC-2010

  18. fin OPAC-2010

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